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1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef MOJO_EDK_EMBEDDER_PLATFORM_CHANNEL_UTILS_POSIX_H_ | |
6 #define MOJO_EDK_EMBEDDER_PLATFORM_CHANNEL_UTILS_POSIX_H_ | |
7 | |
8 #include <stddef.h> | |
9 #include <sys/types.h> // For |ssize_t|. | |
10 | |
11 #include <deque> | |
12 | |
13 #include "base/memory/scoped_ptr.h" | |
14 #include "mojo/edk/embedder/platform_handle.h" | |
15 #include "mojo/edk/system/system_impl_export.h" | |
16 | |
17 struct iovec; // Declared in <sys/uio.h>. | |
18 | |
19 namespace mojo { | |
20 namespace embedder { | |
21 | |
22 // The maximum number of handles that can be sent "at once" using | |
23 // |PlatformChannelSendmsgWithHandles()|. | |
24 // TODO(vtl): This number is taken from ipc/file_descriptor_set_posix.h: | |
25 // |FileDescriptorSet::kMaxDescriptorsPerMessage|. Where does it come from? | |
26 const size_t kPlatformChannelMaxNumHandles = 7; | |
27 | |
28 // Use these to write to a socket created using |PlatformChannelPair| (or | |
29 // equivalent). These are like |write()| and |writev()|, but handle |EINTR| and | |
30 // never raise |SIGPIPE|. (Note: On Mac, the suppression of |SIGPIPE| is set up | |
31 // by |PlatformChannelPair|.) | |
32 MOJO_SYSTEM_IMPL_EXPORT ssize_t | |
33 PlatformChannelWrite(PlatformHandle h, const void* bytes, size_t num_bytes); | |
34 MOJO_SYSTEM_IMPL_EXPORT ssize_t | |
35 PlatformChannelWritev(PlatformHandle h, struct iovec* iov, size_t num_iov); | |
36 | |
37 // Writes data, and the given set of |PlatformHandle|s (i.e., file descriptors) | |
38 // over the Unix domain socket given by |h| (e.g., created using | |
39 // |PlatformChannelPair()|). All the handles must be valid, and there must be at | |
40 // least one and at most |kPlatformChannelMaxNumHandles| handles. The return | |
41 // value is as for |sendmsg()|, namely -1 on failure and otherwise the number of | |
42 // bytes of data sent on success (note that this may not be all the data | |
43 // specified by |iov|). (The handles are not closed, regardless of success or | |
44 // failure.) | |
45 MOJO_SYSTEM_IMPL_EXPORT ssize_t | |
46 PlatformChannelSendmsgWithHandles(PlatformHandle h, | |
47 struct iovec* iov, | |
48 size_t num_iov, | |
49 PlatformHandle* platform_handles, | |
50 size_t num_platform_handles); | |
51 | |
52 // TODO(vtl): Remove this once I've switched things over to | |
53 // |PlatformChannelSendmsgWithHandles()|. | |
54 // Sends |PlatformHandle|s (i.e., file descriptors) over the Unix domain socket | |
55 // (e.g., created using PlatformChannelPair|). (These will be sent in a single | |
56 // message having one null byte of data and one control message header with all | |
57 // the file descriptors.) All of the handles must be valid, and there must be at | |
58 // most |kPlatformChannelMaxNumHandles| (and at least one handle). Returns true | |
59 // on success, in which case it closes all the handles. | |
60 MOJO_SYSTEM_IMPL_EXPORT bool PlatformChannelSendHandles(PlatformHandle h, | |
61 PlatformHandle* handles, | |
62 size_t num_handles); | |
63 | |
64 // Wrapper around |recvmsg()|, which will extract any attached file descriptors | |
65 // (in the control message) to |PlatformHandle|s (and append them to | |
66 // |platform_handles|). (This also handles |EINTR|.) | |
67 MOJO_SYSTEM_IMPL_EXPORT ssize_t | |
68 PlatformChannelRecvmsg(PlatformHandle h, | |
69 void* buf, | |
70 size_t num_bytes, | |
71 std::deque<PlatformHandle>* platform_handles); | |
72 | |
73 } // namespace embedder | |
74 } // namespace mojo | |
75 | |
76 #endif // MOJO_EDK_EMBEDDER_PLATFORM_CHANNEL_UTILS_POSIX_H_ | |
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